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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65cd30da9a405449e55d621ea8266bdab29f3a531402fe4ac295015c9317c6cf' 
  AND token = 'CnWvIQnooy8P31Y8Yt2UaakPtHqoB4Mj4t6lILaI2hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}